Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
  • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
  • B25B27/18—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same withdrawing broken threaded parts or twist drills

Definitions

• the present invention relates to a torque transmitting device.
• the torque transmitting device of the present invention is particularly adapted to be impulse driven into an internal bore in a workpiece.
• a torque transmitting device comprising a shaft having a longitudinal axis, wherein the shaft is formed with at least one groove extending longitudinally of the shaft, a workpiece engaging jaw is mounted in the or each groove, means is provided for retaining the or each jaw in its respective groove, and wherein the or each groove is tilted with respect to the axis of the shaft so that the or each jaw is non-aligned with the longitudinal axis of the shaft.
• FIGURE 1 is a side elevation of a torque transmitting device of the present invention
• FIGURE 2 is an end elevation of the device of Figure 1 along the line II-II of Figure 1
• FIGURE 3 is a sectional view of the device of Figure 1 along the line III-III of Figure 1
• FIGURE 4 is a side elevation of a torque transmitting device similar to that shown in Figure 1 with certain internal features indicated in phantom;
• FIGURE 5 is a side elevation of a workpiece engaging jaw for use with the devices of Figures 1 to 4;
• FIGURE 6 is an end elevation of -the workpiece engaging jaw of Figure 5.
• FIGS 1 to 3 and Figure 4 show respectively two different embodiments of the present invention as will be described hereinafter.
• like reference numerals will be used to denote like parts in the two embodiments.
• a torque transmitting device adapted to be impulse driven into an internal bore in a workpiece.
• the workpiece can take many forms.
• it may be a tube in threaded engagement with a matching component, a threaded shaft, a stud, or a sheared bolt having no external means of torque connection and having a hole therein to receive the device of the present invention.
• the device of Figures 1 to 3 comprises a head 10, a hexagonal nut 11, a metal washer 12 and a slotted annular collar 13.
• the head 10 is integrally formed with an externally threaded shaft 14. Further, the head 10 contains a hexagonal recess 15 arranged to receive an Allen key.
• the nut 11 is threadedly mounted on the shaft 14 and is located adjacent the head 10.
• the washer 12 is located between the nut 11 and the annular collar 13. The washer 12 and annular collar 13 are not threadedly engaged on the shaft 14 but are mounted thereabout in a snug fitting relationship.
• the shaft 14 contains three longitudinally extending grooves 16. Each groove 16 extends from the end of the shaft 14 remote from the head 10 to a point spaced from but adjacent to the head 10.
• each groove 16 is tilted so as to be non-aligned with longitudinal axis 13 of the shaft 14.
• Each groove 16 is tilted towards the direction of rotation of the shaft 14 upon removal of a workpiece.
• the tilting means that jaws 19 which will be described hereinafter, take compression force rather than shear force thus reducing the possibility of shear and facilitating the use of thinner jaws 19.
• the grooves 16 are tilted at an angle in the range from 4 to 40o; more preferably from 4 to 25o, with respect to a diametrical line extending from the centre of the outer end of a groove through the axis of the shaft 14. Further, each groove 16 slopes downwardly into the shaft 14 away from the annular collar 13.
• each groove 16 does not extend parallel to the axis of the shaft 14 but is angled across the face of the shaft 14.
• Each groove 16 is angled across the face of the shaft 14 so as to tend, as it moves away from the annular member 13, towards the direction of rotation on removal of a workpiece.
• the shaft 14 shown in Figure 1 is arranged to be removed in an anti-clockwise direction looking from the head 10.
• the grooves 16 For clockwise removal, the grooves 16 would be angled across the face of the shaft 14 in the opposite direction. By angling the grooves 16 across the face of the shaft 14, applied torque tends to cause the shaft 14 to spiral down jaws 19 as described hereinafter so expanding them.
• the grooves 16 are angled across the face of the shaft 14 at an angle in the range from 1 to 18o to the axis of the shaft.
• the grooves 16 are straight cut for ease of manufacture, for angles above 10o it may be necessary for the grooves 16 to have a helical profile tending towards the direction of rotation when removing a workpiece.
• the grooves 16 are angled at an angle in the range from 1 to 6o across the face of the shaft 14.
• the grooves 16 can be straight or helical right through the range of preferred angles mentioned above.
• the annular collar 13 comprises three slots 18 aligned with the grooves 16 of the shaft 14.
• the slots 18 are arranged to receive the radially outwardly extending projections of jaws 19. This enables the jaws 19 to be retained in place on the shaft 14 when in storage. Further, the slots 18 extend right through the annular collar 13 so that, in use, the jaws 19 may be in abutting relation with the washer 12.
• Each groove 16 is arranged to contain a jaw 19 as shown in Figures 5 and 6.
• Each jaw 19 comprises an elongated workpiece engaging blade 20 which has a quadrilateral shape in cross section.
• each blade 20 is angled to provide a cutting edge 21 for engaging a workpiece.
• Each cutting edge 21 is arranged to be the leading edge of the upper face of its blade 20 upon rotation to withdraw a workpiece.
• each jaw 19 comprises a radially outwardly extending projection 22.
• the jaws 19 are moved down the shaft 14 to an extent sufficient for them to enter a concentric internal bore in a workpiece.
• the shaft 14 is then inserted into the bore until the radially outwardly extending projections 22 of the jaws 19 engage the entrance to the bore.
• the shaft 14 is impulse driven into the bore. This causes the jaws 19 to move rearwardly up the shaft 14 and, because of the slope of the grooves 16, the jaws 19 simultaneously expand outwardly into engagement with the sides of the bore.
• the angling of the grooves 16 causes the shaft 14, when torque is applied to it, to be driven down and around causing proportional expansion of the blades 20 with relation to applied torque.
• the use of impulse drive has the advantage that higher forces can be applied for short periods of time.
• impulse drives are typically arranged to apply a small amount of twist on each impulse which drives the shaft 14 down and around as described above so ensuring good engagement with the interior of the bore.
• the jaws 19 are tilted in the grooves 16, the blades 20 tend to draw the workpiece in so assisting in release of the workpiece.
• the jaws 19 are so shaped that the upper surfaces (as seen in the drawings) of the blades 20 move parallel to the shaft 14 and the bore when the jaws 19 move rearwardly. When the blades 20 are in engagement with the side of the bore the workpiece can then be removed by turning the head 10 so as to move the shaft 14 in the clockwise direction as seen in Figure 3.
• the grooves 16 are tilted as described above and so the turning force tends to act into the body of the shaft 14 and not at right angles to it. This reduces the possibility of the blades 20 being sheared in use. Further, when initially removing the shaft 14, the blades 20 can cut in and tend to become loose. The angling of the grooves 16 across the surface of the shaft 14 has a spiral effect and causes the shaft 14 to move inwardly of the bore to take up any such slack.
• the nut 11 is not essential and as shown in Figure 4 can be omitted altogether. However, it can be moved along the shaft 14 away from the head 10 to limit the amount of possible expansion of the jaws 19. Also, after use, it can be moved down the shaft 14 to push the jaws 19 away from the head 10 to release the jaws 19 from the removed workpiece.
• the shaft 14 in the embodiment of Figures 1 to 3 need only be threaded in the region of the nut 11.
• the shaft 14 shown in Figure 1 is threaded along its entire length but this is for convenience of manufacture only.
• the shaft 14 shown in Figure 4 is not threaded at all. Modifications and variations such as would be apparent to a skilled addressee are deemed within the scope of the present invention.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Jigs For Machine Tools (AREA)
• Drilling Tools (AREA)
• Gripping On Spindles (AREA)
• Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
• Forging (AREA)
• Percussive Tools And Related Accessories (AREA)

Priority Applications (2)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25642414

Family Applications (1)

Country Status (15)

Cited By (1)

Families Citing this family (3)

Citations (6)

Family Cites Families (6)

• 1981
  • 1981-10-02 WO PCT/AU1981/000142 patent/WO1982001150A1/en active IP Right Grant
  • 1981-10-02 GB GB8216241A patent/GB2097706B/en not_active Expired
  • 1981-10-02 CH CH3607/82A patent/CH663174A5/de not_active IP Right Cessation
  • 1981-10-02 DE DE813152416A patent/DE3152416A1/de not_active Ceased
  • 1981-10-02 US US06/387,878 patent/US4446765A/en not_active Expired - Fee Related
  • 1981-10-02 JP JP56503156A patent/JPS57501540A/ja active Pending
  • 1981-10-02 AT AT0907181A patent/AT383765B/de not_active IP Right Cessation
  • 1981-10-02 EP EP81902737A patent/EP0063570B1/en not_active Expired
  • 1981-10-02 NZ NZ198528A patent/NZ198528A/en unknown
  • 1981-10-05 ZA ZA816863A patent/ZA816863B/xx unknown
  • 1981-10-05 CA CA000387326A patent/CA1192064A/en not_active Expired
• 1982
  • 1982-06-04 SE SE8203448A patent/SE446835B/sv not_active IP Right Cessation
• 1984
  • 1984-02-21 US US06/582,187 patent/US4563922A/en not_active Expired - Fee Related
• 1986
  • 1986-08-02 SG SG663/86A patent/SG66386G/en unknown
• 1987
  • 1987-02-05 HK HK112/87A patent/HK11287A/xx unknown
  • 1987-12-30 MY MY175/87A patent/MY8700175A/xx unknown

Patent Citations (6)

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